Objective: There have been studies shown the efficacy of psychological interventions in reducing preoperative anxiety in children undergoing surgery. We constructed an intervention strategy, based on the concept of co-design, for perioperative anxiety behavior in children's outpatient surgery and conducted a prospective randomized controlled research to confirm its effectiveness., Method: This research comprised a total of 100 kids who received surgery in our outpatient clinic between January 2019 and January 2020. According to the random number table approach, all kids were divided into observation as well as control categories, each of which had 50 instances.The behavioral intervention tactics included cognitive intervention before behavioral intervention and behavioral interventions in the environment. The observation cohort was offered behavioral intervention tactics before anesthesia, whereas the control category had surgery under standard anesthesia. The two categories' preoperative visit (T1) mean arterial pressure (MAP) & heart rates (HR) in the anesthesia preparation room (T2), during induction of anesthesia (T3) and 1 hour after surgery (T4) were compared, and the two groups' modified facial expression score (FLACC) at T1 and T4 was compared as well; At T3, the children' degree of cooperation and anxiety were evaluated with Induction Cooperation Scale (ICC) and modified Yale Perioperative Anxiety Scale (mYPAS). The satisfaction degree of the children's family with the surgery was collected 7d after the operation with a Satisfaction Rating Scale prepared by our hospital., Results: The MAP in the observation group was 58.49±6.35 at T1 time, which was not a significant diference from that of the control group (60.12±7.03). Also, the HR in the observation group was 100.27±12.38 at T1 time, with no difference from that in control group. MAP and HR at T2-T4 were remarkably higher in both groups than at T1 (P < .05); & During T2-T4, the group being observed appeared to have lower MAP & HR compared to the group acting as a control (P < .05). At T3, the observation category's ICC & mYPAS scores were significantly poorer than those of the control category (P < .05). On the seventh day following surgery, the satisfaction level of the observation category's family with the procedure was greater than that of the control category. (P < .05)., Conclusion: The behavioral intervention strategy help children undergoing outpatient surgery maintain stable hemodynamic indicators during the perioperative period, reduce their anxiety and improve their cooperation for surgery. In future, the apply of the behavioral intervention strategy will effectively improve the satisfaction of children's family members with surgery.